Selects a Work Items as the current Work Item if it is the first Work Item found when searching a part of a Conveyor starting at "start" distance from the front of the Conveyor and ending at start+length. If there is not a Work Item at the region the current Work Item becomes zero.
Comments
The "front" of a Conveyor is the point where the Work Items travel to while on the Conveyor. To select a Work Item that is ready to be removed from the Conveyor because it has traveled the full length of the Conveyor set the start and length parameters to zero.